adding sync method in phosphor-time-manager

[Velumani T-ERS,HCLTech]

Classification:
Hi Team,

We wanted to add another time sync method in phosphor-time-manager to get the time from the host and set it to BMC. To have this option configurable I propose a dbus property in the time interface(given below). Please provide your feedback/comments.

https://github.com/openbmc/phosphor-dbus-interfaces/blob/master/xyz/openbmc_project/Time/Synchronization.interface.yaml
enumerations:
    - name: Method
      description: >
        Possible methods of time synchronization.
      values:
        - name: NTP
          description: >
            Sync by using the Network Time Protocol.
        - name: Manual
          description: >
            Sync time manually.
         - name: HostSync
          description: >
            Sync the time from host.

Regards,
Velu
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